Sainik School Entrance Exam 2019 Solved Paper

Question : 49 of 150

Marks: +1, -0

A race boat covers a distance of

66 {\km}

downstream in 110 minutes. It covers the same distance upstream in 120 minutes. The speed of the boat in still water is

34.5 {\km} / {\hr}

. The speed of the stream will be

Solution:

(a) Suppose that the speed of stream

=d

km/hr
Then, boat upstream speed

=(34.5-d)

Boat downstream speed

=(34.5+d)

ATQ,

66/{34.5+d}=110/60

345+10d=360

10d=15

d=1.5

km/h.

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